Please help with this question I'm having trouble

4(2x+3)+6x+9=14x+21

0=0

Step-by-step explanation:

4(2x+3)+6x+9=14x+21

8x+12+6x+9-14x-21=0

14x-14x+21-21=0

0=0

c.

step-by-step explanation:

because first you have to add the 4x, 9x, and the 7x together and you get 20x and then you add the last numbers up and you get 5and then you put the subtraction sign in there and that's how you get the answer.

for this case we have that by definition, the surface area of a cylinder is given by:

where:

r: it is the radius of the cylinder

h: it is the height of the cylinder

we can also rewrite it as:

where:

la: it's the lateral area

ba: area of the base

option a